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Self-assembly properties of carboxylated tunicate cellulose nanocrystals prepared by ammonium persulfate oxidation and subsequent ultrasonication.
Carbohydrate Polymers ( IF 11.2 ) Pub Date : 2020-07-31 , DOI: 10.1016/j.carbpol.2020.116835
Jintao He 1 , Kaiqiang Bian 1 , Guangzhe Piao 1
Affiliation  

Tunicate cellulose, extracted from the marine animal, has drawn increasing attention as the high crystallinity and aspect ratio. However, it is hard to prepare tunicate cellulose nanocrystals (tCNCs) with narrow size distribution in the traditional way, especially for the carboxylated samples, which also affects their lyotropic liquid crystal behavior to a certain extent. Herein, carboxylated tCNCs with uniform nanoscale dimensions and high surface charges density were prepared through ammonium persulfate (APS) oxidation and ultrasonic post-processing. Of particular interest, the formation of carboxylated tCNCs lyotropic chiral nematic liquid crystals was observed for the first time, which displayed obvious birefringence and fingerprint texture. Meanwhile, it was found that the critical concentration of phase separation for tCNCs suspension was around 3.5 wt% from the phase diagram. This study provides an efficient way to fabricate carboxylated tCNCs, and the self-assembly properties may lead to great potential applications in constructing advanced functional materials.



中文翻译:

通过过硫酸铵氧化和随后的超声处理制备的羧化的束缚纤维素纳米晶体的自组装性能。

从海洋动物中提取的束状纤维素因其高结晶度和长宽比而受到越来越多的关注。但是,传统方法难以制备出粒径分布窄的被膜化纤维素纳米晶体(t CNCs),特别是对于羧化样品,这在一定程度上影响了它们的溶致液晶性能。本文中,通过过硫酸铵(APS)氧化和超声后处理制备了具有均匀纳米级尺寸和高表面电荷密度的羧化t CNCs。特别令人感兴趣的是,羧化t的形成首次观察到CNCs溶致手性向列型液晶,显示出明显的双折射和指纹纹理。同时,从相图发现,t CNCs悬浮液的相分离的临界浓度为约3.5重量%。这项研究提供了一种制造羧基化t CNC的有效方法,其自组装性能可能会在构建高级功能材料方面带来巨大的潜在应用。

更新日期:2020-08-05
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